and let me tell you the descent is SO much smoother and there's LOTS more hang time at the end.

Yes it will be smoother because of the lower main rotor rpm, but no, you will not have a longer hang time. Many things will play into this...such as if your at a 200 foot hover, and put the engine to idle, and go straight to -10 degrees, your blades can actually slow down because you try to grab more air than what the heli is already having, and with no engine to keep them spinning, they will slow down quite a bit...so if your doing 100 foot autos, yes you probably will have a longer hang time if you go to 0 all the way down, rather than doing -10 from 100 feet all the way down to 5 feet. But if you take your heli up to 700 feet, and go to 0 degree's, flare, hang it there, then land...then do the same thing but go to -10 degrees, your head speed will spin up MUCH more than at 0 degrees, thus having more main rotor RPM for the hang time...So tell me how a lower main rotor rpm will have a longer hang time than a higher main rotor rpm.....

What purpose in Combat would flying inverted accomplish.

There are plenty of purposes:

1. Flip to inverted - then while your opponent is sitting there gazing in amazement hit him with a hellfire!

2. If you can invert then you can tic-toc - imagine how much ordanence you can deploy like that!

3. Run out of ammo with those tic-tocs - no problem - turn her inverted and give the enemy a new hair cut

4. Psycological warfare - if you're inverted the enemy will be convinced that this is not possible (since helis cannot go inverted). This will be enough to convinve him that you are upright and he is inverted. Result is that he falls off the earth to his death!

So tell me how a lower main rotor rpm will have a longer hang time than a higher main rotor rpm

I never said that a lower RPM would have more hang time, I simply said that when I auto with 0 degrees I have more hang time after the flare.

You're assuming that coming down at 0 will reduce the RPM but it doesn't. I know it sounds nuts, I would have never believed it if I hadn't seen it and tried it myself.

I know you'll get a much faster descent at -10, but I'm not sure you'll get more RPM that way. I've always noticed that when I come down with a lot of negative that the RPM doesn't really come up big until I flare and take some negative out... that's when the airspeed gets traded into RPM.